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Dual Gilbert Cell Mixer with Offset Cancellation

a gilbert cell mixer and offset cancellation technology, applied in the field of electronic devices, can solve the problems of parasitic capacitance of mixer devices, resistors, etc., and capacitors of second stages providing considerable capacitance load, so as to improve the mixing of signals and enhance the quality of output signals.

Inactive Publication Date: 2009-06-11
EPCOS AG
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Benefits of technology

The present invention provides an electronic device for a mixer circuit that improves the quality of output signals by enhancing the mixing of signals with steep slopes, such as square waves. The device includes two mixer portions that receive input signals and provide output signals. The input signals are swapped between the two mixer portions, which helps to compensate for any parasitic capacitances or resistors in the load paths. The device also includes a single electrical path for each mixer portion, which reduces the impact of non-ideal properties of the electronic devices. The second stages of the mixer portions provide a significant capacitive load, which further reduces the impact of parasitic capacitances. The invention is especially useful for processing square wave input signals of the same frequency.

Problems solved by technology

Such a single mixer device provides parasitic capacitances, resistors, etc, due to non-ideal properties of the electronic devices.
The parasitic capacitors of the second stages provide a considerable capacitive load.

Method used

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  • Dual Gilbert Cell Mixer with Offset Cancellation
  • Dual Gilbert Cell Mixer with Offset Cancellation
  • Dual Gilbert Cell Mixer with Offset Cancellation

Examples

Experimental program
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Embodiment Construction

[0028]FIG. 1 shows a simplified schematic of a double balanced Gilbert cell mixer according to the prior art. The Gilbert cell mixer includes two electrical paths PL, PR including output resistors RL and RR. The electrical paths PL, PR are coupled to VDD via output resistors RR, RL and with the other end to the differential transistor pairs T1, T1′ and T2, T2′. The load or output resistor RL is coupled to transistors T1 and T2. The output resistor RR is coupled to T1′ and T2′. The inputs of the transistors T1 and T2′ are coupled to a first input pin A and the base of transistors T1′ and T2 are coupled to input pin B. The emitters of the two transistors T1 and T1′ are coupled both to the collector of transistor T3. The base of transistor T3 provides a further input pin C. Likewise, the emitters of transistors T2 and T2′ are coupled both to the collector of transistor T4, which provides a fourth input pin D on its base. Transistors T3 and T4 have a common emitter, which is coupled to ...

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Abstract

An electronic device includes a first mixer portion having a first stage and a second stage, and a second mixer portion having a first stage and a second stage. A first electrical path is coupled to the first mixer portion and the second mixer portion, and a second electrical path is coupled to the first mixer portion and the second mixer portion. The first mixer portion is adapted to receive a first input signal on the first stage and a second input signal on the second stage. The second mixer portion is adapted to receive the second input signal on the first stage and the first input signal on the second stage.

Description

[0001]This application is a continuation of co-pending International Application No. PCT / IB2007 / 053138, filed Aug. 8, 2007, which designated the United States and was published in English, and which claims priority to European Application No. 06118709.2 filed Aug. 10, 2006, both of which applications are incorporated herein by reference.FIELD OF THE INVENTION[0002]The present invention relates to an electronic device including a mixer for mixing two input signals.BACKGROUND[0003]Frequency translation in electronic data processing systems is usually performed by devices known as mixers. There are various different architectures for mixing two signals for modulation purposes covering simple single ended, single balanced mixers, and double balanced mixers providing, e.g., improved isolation from the local oscillator (LO). The most popular double balanced mixer used in radio frequency integrated circuit designs is the Gilbert cell mixer. The Gilbert cell is basically a cross-couple diff...

Claims

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Application Information

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Patent Type & Authority Applications(United States)
IPC IPC(8): H04B1/26G06G7/14
CPCH03D7/1433H03D7/1458H03D7/165
Inventor RUIJS, LEONARDUS C. H.
Owner EPCOS AG
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